When you ask "What number is halfway between 21 and 524?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=524.
To find the number halfway between 21 and 524, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 524 into our formula, we get:
(21 + 524)/2 = 272.5
Thus, the number halfway between 21 and 524 is 272.5.
To check that our answer is correct, we subtract 21 from 272.5 and subtract 272.5 from 524 and compare the two numbers:
272.5 - 21 = 251.5
524 - 272.5 = 251.5
As you can see, the halfway number is 251.5 higher than 21 and 251.5 lower than 524. Therefore, our halfway between answer of 272.5 above is correct.
Halfway Between
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Halfway Between 21 and 525
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